Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/4602#issuecomment-89903531
Yea, that's quite headache, all of the output attribute are created within
the `Generate`, and will be bundled by its parent nodes later, the difficulty
is to keep the `exprId` of the output attributes consistency during the node
transform / copying.
I will think of that more deeply.
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